Weed Eater 2600 manual Configuring Voice Activity Detection VAD, Fine-Tuning Analog Voice Ports

Cisco High-Density Analog Voice and Fax Network Module

Configuration Tasks

Configuring Voice Activity Detection (VAD)

Voice activity detection (VAD) is configured on dial peers; by default it is enabled. For more information, see the “Configuring Dial Plans, Dial Peers, and Digit Manipulation” chapter in the Cisco IOS Release 12.2 Voice, Video, and Fax Configuration Guide, Release 12.2. Two parameters associated with VAD, music threshold and comfort noise, are configured on voice ports.

If VAD is enabled, use the following commands to adjust parameter values associated with VAD, beginning in voice-port configuration mode:

	Command	Purpose
Step 1
	Router(config-voiceport)# music-thresholdnumber	Specifies the minimal decibel level of music played
		when calls are put on hold. The decibel level affects
		how voice activity detection (VAD) treats the music
		data. Valid entries range from –70 to –30. When
		used with VAD, if the level is set too high, the
		remote end hears no music; if it is set too low, there
		is unnecessary voice traffic. The default is –38.
Step 2
	Router(config-voiceport)# comfort-noise	This parameter creates subtle background noise to
		fill silent gaps during calls when VAD is enabled on
		voice dial peers. If comfort noise is not generated,
		the resulting silence can fool the caller into
		thinking the call is disconnected instead of being
		merely idle. The default is that comfort noise is
		enabled.

Fine-Tuning Analog Voice Ports

Normally, default parameter values for voice ports are sufficient for most networks. Depending on the specifics of your particular network, however, you may need to adjust certain parameters that are configured on voice ports. Collectively, these commands are referred to as voice-port tuning commands.

Note The commands, keywords, and arguments that you are able to use may differ slightly from those presented here, based on your platform, Cisco IOS release, and configuration. When in doubt, use Cisco IOS command help (command ?) to determine the syntax choices that are available.

The voice-port tuning commands are grouped into these categories and explained in the following sections:

•Configuring Disconnect Supervision Commands (optional)

•Configuring FXO Supervisory Disconnect Tone Commands (optional)

•Configuring Timeouts Commands (optional)

•Timing Commands (optional)

•Voice Quality Tuning Commands (optional)

Full descriptions of the commands in this section can be found in the Cisco IOS Voice, Video, and Fax Command Reference, Release 12.2.

Cisco IOS Release 12.2(2)XT and 12.2(8)T

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